Do Air Source Heat Pumps Make Noise? What You Should Know

Mariel • April 10, 2026

How Loud Are Modern Heat Pumps?

Heat is measured in decibels (dB), and most contemporary air source heat pumps operate between 40 and 60 dB. To put that in context:


30–40 dB: A whisper or a quiet library

40–50 dB: A refrigerator humming in the kitchen

60 dB: A normal conversation


Up close, a heat pump sounds similar to your fridge humming. Step a few metres away, and it blends seamlessly into the background sounds of everyday life, such as rustling leaves or passing traffic. The days of clunky, loud units are long gone—today’s models are engineered for quiet residential use.

When Will You Hear the Heat Pump?

While modern units are very quiet, they are not completely silent. The fan and compressor create minimal sound as they move air and heat the refrigerant.


During cold weather, frost can sometimes form on the unit. To remove it, the system runs a brief defrost cycle, which may produce a short whooshing sound. This is entirely normal and only lasts a few minutes.

Why Professional Installation Matters

Even the quietest unit can become disruptive if installed incorrectly. Placement is key. Professional installers:

  • Choose a location away from bedrooms or tight, echo-prone spaces
  • Use anti-vibration mounts to absorb motor movement and prevent noise from travelling through the home structure

This ensures your system is both effective and unobtrusive.

With the right technology and expert installation, you don’t have to compromise between eco-friendly heating and a peaceful home environment. If you’re ready to experience efficient, low-noise heating for your home, Darlington Heat Pumps is here to help. Our expert team designs and installs high-performance air source heat pump systems tailored to your property, ensuring maximum comfort with minimal noise. Get in touch today to book your consultation and make the switch to quieter, greener heating.

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